Don't have a 3-9, but I do have a fixed 4 rimfire classic. I love that little scope. I bought a 2-7 Leupold rimfire first for a sako p72, very nice scope. Then when I built my 10/22 I needed another and went with the weaver for about a 1/2 of the price. Never a problem with either, but i actually prefer the weaver. The reticle is just a smidge heavier, and I think as a general purpose 22 scope 4x is the sweet spot for me.
Anyway no info on the 3-9, but I've been very impressed with the optics, and durability of the 4x. And I've no doubt the 10/22 has been much harder on the scope, as well as myself. Holds zero perfectly.